The law compells no man to impossible things. The argument ab impossibili is forcible in law.
Sir Edward Coke, Sir Thomas Littleton, Francis Hargrave, Charles Butler, Sir Matthew Hale (1823). “The First Part of the Institutes of the Laws of England: Or, A Commentary Upon Littleton. Not the Name of the Author Only, But of the Law Itself ... Hæc Ego Grandævus Posui Tibi, Candide Lector”, p.129